Option to configure default MFA

[manishtomar]

The tool asks to choose MFA when running every-time:

INFO[0002] Requesting MFA. Please complete two-factor authentication with your second device
INFO[0002] Select a MFA from the following list
INFO[0002] 0: OKTA (push)
INFO[0002] 1: OKTA (token:software:totp)

And I always end up choosing the same option. It will be nice to provide this option in configuration file to avoid selecting the same option every time.

[nickatsegment]

Duplicates #108? Can reopen if I'm misunderstanding.